/* eslint-disable */
require('script-loader!file-saver');
require('./Blob');
require('script-loader!xlsx/dist/xlsx.core.min');
import XLSX from "xlsx-style";
function generateArray(table) {
  var out = [];
  var rows = table.querySelectorAll('tr');
  var ranges = [];
  for (var R = 0; R < rows.length; ++R) {
    var outRow = [];
    var row = rows[R];
    var columns = row.querySelectorAll('td');
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C];
      var colspan = cell.getAttribute('colspan');
      var rowspan = cell.getAttribute('rowspan');
      var cellValue = cell.innerText;
      if (cellValue !== "" && cellValue === +cellValue) cellValue = +cellValue;
      ranges.forEach(function (range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
        }
      });
      if (rowspan || colspan) {
        rowspan = rowspan || 1;
        colspan = colspan || 1;
        ranges.push({s: {r: R, c: outRow.length}, e: {r: R + rowspan - 1, c: outRow.length + colspan - 1}});
      }
      outRow.push(cellValue !== "" ? cellValue : null);
      if (colspan) for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
}

function datenum(v, date1904) {
  if (date1904) v += 1462;
  var epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {s: {c: 10000000, r: 10000000}, e: {c: 0, r: 0}};
  for (var R = 0; R !== data.length; ++R) {
    for (var C = 0; C !== data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R;
      if (range.s.c > C) range.s.c = C;
      if (range.e.r < R) range.e.r = R;
      if (range.e.c < C) range.e.c = C;
      var cell = {v: data[R][C]};
      if (cell.v == null) continue;
      var cell_ref = XLSX.utils.encode_cell({c: C, r: R});
      if (typeof cell.v === 'number') cell.t = 'n';
      else if (typeof cell.v === 'boolean') cell.t = 'b';
      else if (cell.v instanceof Date) {
        cell.t = 'n';
        cell.z = XLSX.SSF._table[14];
        cell.v = datenum(cell.v);
      }
      else cell.t = 's';
      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
  return ws;
}

function Workbook() {
  if (!(this instanceof Workbook)) return new Workbook();
  this.SheetNames = [];
  this.Sheets = {};
}

function s2ab(s) {
  var buf = new ArrayBuffer(s.length);
  var view = new Uint8Array(buf);
  for (var i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
  return buf;
}

export function export_table_to_excel(id) {
  var theTable = document.getElementById(id);
  var oo = generateArray(theTable);
  var ranges = oo[1];
  var data = oo[0];
  var ws_name = "SheetJS";
  var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
  ws['!merges'] = ranges;
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;
  var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'});
  saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), "test.xlsx")
}

function formatJson(jsonData) {
  console.log(jsonData)
}

export function exportJsonToExcel({
                                    multiHeader = [],
                                    header,
                                    data,
                                    filename,
                                    merges = [],
                                    autoWidth = true,
                                    bookType = 'xlsx'
                                  } = {}) {
  /* original data */
  filename = filename || 'excel模板'
  data = [...data]
  data.unshift(header);
  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i])
  }
  var ws_name = "SheetJS";
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }

  if (autoWidth) {
    /*设置worksheet每列的最大宽度*/
    const colWidth = data.map(row => row.map(val => {
      /*先判断是否为null/undefined*/
      return {
        'wch': val == null || val === '' ? 15 : val.toString().length * 2 < 15 ? 15 : val.toString().length * 2 > 60 ? 60 : val.toString().length * 2
      }
    }))
    /*以第一行为初始值*/
    let result = colWidth[0];
    for (let i = 1; i < colWidth.length; i++) {
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j]) {
          if (result[j]['wch'] < colWidth[i][j]['wch']) {
            result[j]['wch'] = colWidth[i][j]['wch'];
          }
        }
      }
    }
    ws['!cols'] = result;
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;
  var dataInfo = wb.Sheets[wb.SheetNames[0]]
  const borderAll = {  //单元格外侧框线
    top: {
      style: "thin"
    },
    bottom: {
      style: "thin"
    },
    left: {
      style: "thin"
    },
    right: {
      style: "thin"
    }
  };
  //给所有单元格加上边框
  for (var i in dataInfo) {
    if (i === '!ref' || i === '!merges' || i === '!cols' || i === 'A1') {

    } else {
      dataInfo[i + ''].s = {
        border: borderAll,
        font: {
          name: '微软雅黑',
          sz: 12
        },
        alignment: {
          horizontal: "center",
          vertical: "center"
        },
      }
    }
  }
  //设置主标题样式
  const excelTyle = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'AA', 'AB', 'AC', 'AD', 'AE']
  excelTyle.some(function (v) {
    for (let j = 1; j < multiHeader.length + 3; j++) {
      const _v = v + j
      if (dataInfo[_v]) {
        dataInfo[_v].s = {};
        if (j === 1) {
          dataInfo[v + j].s = {
            border: borderAll,
            font: {
              name: "微软雅黑",
              sz: 13,
              color: {
                rgb: "000000"
              },
              bold: true,
              italic: false,
              underline: false
            },
            alignment: {
              horizontal: "center",
              vertical: "center"
            },
            fill: {
              fgColor: {
                rgb: "E8E8E8"
              }
            },
          };
        } else {
          // 标题部分A1-Z1
          // if (multiHeader.length === 0) {
          //   // multiHeader.length = 0 时表头没有合并单元格，表头只占1行A2-Z2
          //   const fv = v + (multiHeader.length + 2)
          //   dataInfo[fv].s = {
          //     border: borderAll,
          //     font: {
          //       name: "微软雅黑",
          //       sz: 13,
          //       bold: true,
          //     },
          //     alignment: {
          //       horizontal: "center",
          //       vertical: "center"
          //     },
          //     fill: {
          //       fgColor: {
          //         rgb: "E8E8E8"
          //       },
          //     },
          //   }
          // } else
            if (multiHeader.length === 1) {
            // multiHeader.length = 1 时表头有合并单元格，表头只占2行A2-Z2，A3-Z3，这是没有描述信息只有表头合并的
            dataInfo[v + j].s = {
              border: borderAll,
              font: {
                name: "微软雅黑",
                sz: 13,
                bold: true
              },
              alignment: {
                horizontal: "center",
                vertical: "center"
              },
              fill: {
                fgColor: {
                  rgb: "E8E8E8"
                }
              },
            }
          } else if (multiHeader.length > 1) {
            // multiHeader.length > 1 时表头有合并单元格，表头多行
            dataInfo[v + j].s = {
              border: borderAll,
              font: {
                name: "微软雅黑",
                sz: 13,
                bold: true
              },
              alignment: {
                horizontal: "center",
                vertical: "center"
              },
              fill: {
                fgColor: {
                  rgb: "E8E8E8"
                }
              },
            }
          }
        }
        if (dataInfo[v + (multiHeader.length + 2)]) {
          dataInfo[v + (multiHeader.length + 2)].s = {
            border: borderAll,
            font: {
              name: "微软雅黑",
              sz: 12,
            },
            alignment: {
              horizontal: "center",
              vertical: "center"
            }
          }
        }
      }
    }
  });

  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  });
  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), `${filename}.${bookType}`);
}